https://bugzilla.wikimedia.org/show_bug.cgi?id=37225
--- Comment #6 from Aaron Schulz <aschulz4...@gmail.com> 2012-06-05 21:33:11
UTC ---
I see the line:
$this->loadPageData( 'fromdbmaster' );
...before the text is loaded in WikiPage::doEdit(). It will the page_latest
field from the master to get the revision/text. That text is compared to the
incoming text to see if anything changed. In fact, wrapped outside of this,
EditPage has a loadPageData( 'forupdate' ) call in internalAttemptSave(). It
doesn't seem like it should be easy for this to happen.
There is a "$dbw->begin( __METHOD__ );" right after $change is checked in
doEdit(). This will release the FOR UPDATE lock. In theory, another process can
save an edit after that and cause a race.
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